Update README.md

README.md

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+> [!NOTE]
+> **GraKeL needs your support!**
+> Our goal with GraKeL was to have a stable library but as tools change it requires maintenance:
+> Lots of libraries change requiring constant pull requests to keep up with newer python/numpy versions,
+> or for example modernizing our ci-cycle was not finalized and the owner currently lacks knowledge and time to go over changes.
+> If there is a community of researchers that want to be part of grakel's support please reach out,
+> to ioannis<dot>siglidis<at>enpc<dot>fr and we would be happy to gradually move you into maintenance.
+> Thank you! 💕
 
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